doc: update some doc

wfassoc/README.md

@@ -1,3 +1,12 @@
-# Wfassoc Core
+# WFassoc Core
 
-Most Windows related struct are located in `assoc` module. The top module only contain structs exposed for convenient use of end user.
+This crate provides low level API and high level API for manipulating Windows file associations at the same time.
+For the convenient use of this project, the root module of this crate re-expose high level API.
+So programmers can directly use them.
+
+High level API is type-safe and very easy to use for common application.
+For visiting high level API, please use crate root module directly or `highlevel` module.
+Oppositely, for visiting low level API, please use `lowlevel` module.
+
+If you are a programmer who want to take a deep into the internal implementations,
+see `win32` module and its submodules for detail.

wfassoc/src/highlevel.rs

@@ -23,6 +23,10 @@ pub enum ProgramError {}
 
 // endregion
 
+// region: Schema
+
+// region: Schema Body
+
 /// Schema is the sketchpad of complete Program.
 ///
 /// We will create a Schema first, fill some properties, add file extensions,
@@ -125,6 +129,10 @@ impl Schema {
     }
 }
 
+// endregion
+
+// region: Schema Internals
+
 /// Internal used struct as the Schema file extensions hashmap value type.
 #[derive(Debug)]
 struct SchemaExt {
@@ -143,8 +151,18 @@ impl SchemaExt {
     }
 }
 
+// endregion
+
+// endregion
+
+// region: Program
+
+// region: Program Body
+
 /// Program is a complete and immutable program representer
-pub struct Program {}
+pub struct Program {
+
+}
 
 impl TryFrom<Schema> for Program {
     type Error = ParseProgramError;
@@ -159,3 +177,12 @@ impl Program {
         todo!()
     }
 }
+
+// endregion
+
+// region: Program Internals
+
+
+// endregion
+
+// endregion